Fastening device



c. s. ANDERSON FASTENING DEVICE Filed April 14. 1941 Jan. 5,1943.

INVENTOR. fialzdensow I.

Patented Jan. 5, 1943 F UNITED STATES PATENT OFFICE FASTENING DEVICE Chester Sig Anderson,-St. -Charles, Ill.

Application April 14, 1941, Serial No. 388,386 2 Claims. (oi. 8'5-.-i29) The present invention relates to a fastening tion of finish coats of plaster or other surface device for attaching panels of plasterboard or media. the like upon a frame in such manner as to make Figure is a view in horizontal cross-section provision for relative movement to the sheet of taken on the lines 5-5 of Figure 4. plasterboard with respect to other sheets and 5 Figure 61s an isometric view of amodified form with respect to the studding or joist to which it of cap. is attached. Referring more particularly to the disclosure The natural thermal expansion and contracin the drawing, sheets of plasterboard I or simition of plasterboard is recognized. In addition lar material are attached to studdings'2 and it is well-known that studdings or joists made 10 headers or foot rails of a frame as shown in of Wood are subject to considerable contraction Figure 4. and expansion, and in addition other causes such In operation, the nail 3 is driven through the as uneven settling of the building frequently plasterboard and into the wood frame at intercauses undue pressure upon the wallboard and vals of approximately eight inches. The nail 3 the finished product which results in unsightly has a head 4 and a point 5 at the end opposite cracks and crevices the head. Intermediate the point 5 and the head It is the object of my invention to provide 4 is an enlarged h p 5 Which is P d at means of attachment which will permit alimited ficient distance from the head 4 to span the shifting of the panels to conform to the movethickness 0 the p a d he l 3 is ment of the panels or the framework to which ve into position so that the head rests li h y it is attached, at all times and particularly after against the outer surface of the panel of plasterthe finish coats of plaster are applied to the ard I. AS the hump 6 which is larger than panels of plasterboard. the diameter of the rest of the shaft of the nail, A further object is to provide a more ecop sse through the p er it cre s an nomical and durable means of attaching the op n n f considerably greater diameter t an panels to the studding or other support in the the diameter of the rest of the shaft and will erection of modem lo t b ildings. allow considerable play between the relative po- A still further object is to provide a combinasition of the plaster panel and the framework. tion f nail and cap which can be attached at After the nails 3 are driven home to hold the the factory and which can be driven into place plasterboard, it is necessary t0 make p v on in one operation, thereby comparing very favoragainst the binding effect of the finish coats of ably in labor time in installing with the conven- P er w ich would otherwise bind the nail tional nail used before this improved type of d 4 0 the panel I p e this by a s m i a thought f, of a cap I which has a cross-section slightly Further objects are to provide a construction larger than the cross-section of the head of the of maximum simplicity, efficiency, economy, ease nail to form a covering for the head of the nail.

of assembly and operation, and suchfurther ob- Th an has a p ali y of W d -sh ped projects, advantages and capabilities as will later trusions 8, each of which are driven into the more fully appear and are inherently possessed plasterboard to hold the cap in place. The cap is thereby. also provided with flanges 9 which are adapted The invention further resides in the combinato bend around the edge of the nail head 4 at tion, construction and arrangement of parts ilthe fastening where such nails are made or at lustrated in the accompanying drawing, and any time prior to driving the nail through the while I have shown therein a preferred embodip as e bo d. The C p is of su ficient diameter ment, it is to be understood that the same is susto permit limited movement of the head 4 within ceptible to modification and change without dethe cap I so that free play is allowed between parting from the spirit of my invention. the nail and the cap. The modified form of cap In the drawing: shown in Figure 6 is adapted to be applied to Figure 1 is an isometric view of one of the elethe nail after the nail has been driven into the merits of my novel fastening device. studding. It is provided with flanges ID to hold Figures 2 and 3 are isometric views of such it in place over the nail head 4 and onto the element provided with a cap for such element. plasterboard I. It is to be observed that either Figure 4 is an isometric view showing sections form of cap which I show may be stamped from of wallboard or other siding secured in place by a single piece of metal. By having the nail and my novel fastening device prior to the applicacap assembled in one unit, much labor in attaching the wall board may be saved inasmuch as but one operation is required in driving the nail and cap home.

After the caps are fastened in place over each of the nails, a finish coat of one or two coats of plaster is applied to the panels, covering the panels I and the caps 1. I have found that it is preferable to have the crown of the cap slightly rounded to obviate the danger of being dislocated by the trowel when the plaster coat is added.

Experiments and tests have shown that with this invention the plasterboard and plaster are held to the framework securely but withsufiicient yieldability with respect to lateral strain upon the plasterboard and plaster to prevent cracks in the plaster or to reduce the same to a minimum.

Having thus described my invention, what I claim as new and desire to secure as Letters Patent is:

I claim:

1. In a device of the class described, the combination of a nail having a shank, pointed at one end and provided with a head at the other end, an approximately fiat cap of substantially greater area than and covering the head of the nail, and anchoring projections on the cap normally spaced from the periphery of the head to allow limited movement of the head within the plane of the cap.

2. In a device of the class described for attaching wall surfacing to a frame, a nail having an enlarged head, and an enlarged substantially conical shaped portion on the shank at a point intermediate the point and head of said nail to provide an opening in said wall surfacing larger than the diameter of said shank, and a substantially fiat cap for said nail head provided with anchoring projections for attachment to said wall surfacing and permitting co-planar movement of said nail head within the confines of said cap.

CHESTER SIG ANDERSON. 

